Shifting spanner



' UNITED STATES PATENT OFFICE.

KARL KISSENDORFER, F OBERNDORF-ON-THE-NECKAR, GERMANY, ASSIGNOR T0 WAFFENFABRIK MAUSER, A. Gr., OF OBERNDORF-ON-THE-NECKAR, GERMANY.

SHIFTING SPANNER.

Application led August 26, 1921.

To all 'whom t may concern:

Be it known that I, KARL KrssnNDonrnn, engineer, a citizen of the German Republic, residing at Oberndorf-on-the-Neckar, Germany, have invented certain new and useful Improvements in Shifting Spanners, (for which I have iiled applications in Germany,

' December 18, 1919, and in Spain, April 21,

1921, both applications filed in the name of l/Vaffenfabrik Mauser, A-'Gr., of Oberndorf on the Neckar, Germany, with my knowledge and consent,) of which the following is a specification.

This invention relates in general to shifting spanners, and more particularly to spanners of this kind in which the movable jaw is shifted by means of a worm that can be brought out of engagement with its rack. To this end the worm is journalled in a slide arranged in the said movable jaw.

The invention is illustrated in the drawing in which Figure 1 is a front view of the shifting Spanner;

Fig. 2 is a view of a part of the shaft with the movable jaw in section;

Fig. 3 is a side view;

Figs. 4, 5, and 6 are side, end, and bottom views respectively of the slide;

Fig. 7 is a view of the pivot of the worm;

Fig. 8 is a view of the pivot as seen from the left of Fig. 7; and Fig. 9 is a bottom view as seen in the direction of the arrow of Fig. 7.

The screw-key or Spanner consists of a handle or shaft a of a known form with a rack at one edge and a fixed jaw b at its top end. Arranged at the bottom end of the movable jaw c, which has a smooth longitudinal opening for the shaft a, is a worm d which engages in a known manner withthe teeth of the rack. As shown in the drawing the worm d is journalled on a xed pivot pin e which extends downwardly through a suitable hole in the slide f and has a T-shaped head g slidably engaged in a short T-shaped guide groove h in the bottom face of the movable jaw c. The slide f is adapted to execute a short sliding motion along the lower end of the movable Sneccation of Letters Patent.

Patented J an. 24, 1922.

Serial No. 495,506.

jaw c and has an oblong hole for the handle or shaft a, this hole being long enough to permit of transverse movements of the slide. The end of the slide, opposite to its end in which the worm is arranged, is bent up square and the upwardly extending limb e' acts both as a pressure member and as a guide member for the movable jaw. For the latter reason the limb e' is broadened at its upper end in the form of a disk that engages with a cavity of a corresponding shape in the back edge of the movable jaw. By this arrangement the slide j", which is guided at the worm side 0f the shaft by the T-shaped head g of the pivot pin c engaging with the groove 7L, is also securely guided in the jaw c at the opposite side of the shaft. The screw y' keeps the worm in position on the pivot e whilst allowing it to rotate freely thereon. Arranged between the movable jaw and the pressure member z' is a spring if: which tends to keep the worm in continual engagement with the rack a. On the pressure member z' being pressed inward the spring la yields and the worm is shifted out of engagement with the rack, whereupon the movable jaw may be quickly slipped up or down in the well-known manner. The above-described manner of guiding the slide offers the advantage that the slide and the worm can be easily put in or taken out.

I claim 1. In a Spanner, the combination of a shaft provided with a fixed jaw and with a rack, a movable jaw on said shaft, a member mounted to slide bodily along the bottom face of the movable jaw and having a depending pivot pin fixed to one end of it, a` worm rotatably mounted on said pin for movement with the slide into and out of engagement with the rack, a spring associated with the slide for normally holdin the same in position to engage the rack and worm, and a finger-piece on said slide to move it bodily, against the action of the spring, in a direction to disengage the worm fromv the rack.

2. In a shifting Spanner, a shaft provided with a rack, a movable jaw on the shaft .cavity and adapted to he pressed into the having a groove at one side of the shaft and adapted to rotate on the said pivot and to a cavity at the other side of the shaft, a engage with the said rack. transverse slide having an upwardly extend- In testimony whereof I aix my signature.

ing portion slidably arranged in the said KARL KISSENDORFER Witnesses:

E. SGHLEICHER,

FRmDA KLAIBER.

same a pivot extending through a hole in the sfide and having a T-shaped head adapted to travel in the said groove, and a Worm 

